Highlights

* OpenTracing support. See `temporal-opentracing/README.md` for info. Thanks @Spikhalskiy!
* Bugfixes

All changes
2021-02-26 - a47baff - Updated Gradle and dependencies. (#366)
2021-02-26 - acc3dc1 - Adding release notes for 1.0.6 (#369)
2021-02-26 - e8b03f9 - Make keep alive configurable and opt-in (#367)
2021-03-06 - af9c158 - Workflowtest refactoring (#368)
2021-03-08 - 3cd5222 - Add addWorkflowImplementationFactory ability to the rule to support what DynamicWorkflowTest needs. (#376)
2021-03-08 - 6267972 - Factored out Child tests and a few others (#377)
2021-03-10 - b3fad1d - InboundActivityInterceptor now has an access to header (#375)
2021-03-16 - 1aa7f54 - Update Dependencies (#389)
2021-03-17 - 5f2ac61 - Factored out Signal Tests (#383)
2021-03-17 - 9c384fc - Added missing cause to WorkflowTaskFailedEventAttributes (#388)
2021-03-24 - 5161638 - Dependency Update (#398)
2021-03-24 - fd6bb90 - Add WorkflowStubCallsInterceptor which provides an access to Headers (#382)
2021-03-28 - c802327 - Fix a typo in workflowClientCallsInterceptor() method name introduced in #382 (#399)
2021-03-29 - 81f3d04 - Dependency Update  (#408)
2021-03-31 - 8384e53 - Refactor WorkflowTest (#390)
2021-03-31 - b682a2d - Fix TestWorkflowRule#Builder#setWorkerFactoryOptions method signature in accordance with Builder interface (#415)
2021-03-31 - fcec2aa - Make child workflowId available for Interceptors (#409)
2021-04-01 - 5a33a8b - Delete WorkflowTest + Cleanup (#416)
2021-04-01 - b32dca8 - Make TestWorkflowService#continueAsNew respect headers of the original StartWorkflowExecutionRequest (#419)
2021-04-02 - ba691a2 - Testworkflowrule Interceptor Fix (#421)
2021-04-05 - 45cb71c - Dependency Update (#426)
2021-04-05 - d9a0c15 - OpenTracing module is implemented (#418)
2021-04-06 - 057f75d - Fix a potential NullPointer in exception processing inside WorkflowStubImpl (#429)
2021-04-06 - 0c5ae20 - Dependency Update (#428)
2021-04-06 - b642a75 - Fixed timeout property documentation (#411)
2021-04-08 - fd28e21 - Polish temporal-opentracing module (#430)
2021-04-09 - dffa6ee - Disable flaky tests until they are fixed (#427)
